✦ LIBER ✦

Enhanced spherulite growth rates of isotactic polypropylene in incompatible blends

✍ Scribed by G. St-Jean; M. C. Barreto; G. R. Brown

Publisher: Society for Plastic Engineers
Year: 1990
Tongue: English
Weight: 731 KB
Volume: 30
Category: Article
ISSN: 0032-3888
DOI: 10.1002/pen.760301714

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Isothermal radial growth rates (G) of isotactic polypropylene (iPP) spherulites in immiscible blends with a polyethylene based ionomer (1) partially neutralized with Zn^+2^, (2) completely acidified, and (3) completely esterified have been determined at crystallization temperatures between 118 and 124°C by time‐lapse photomicroscopy. In these blends iPP spherulites grow with increased G as compared to that of pure iPP. This behavior is attributed to increases in the rate of transport, due to limited miscibility induced by mechanical mixing. However, subtle differences in the melting behavior suggest that changes in Spherulite morphology may also be a contributing factor.

📜 SIMILAR VOLUMES

Crystallization behavior and spherulite

Crystallization behavior and spherulite growth rate of isotactic polypropylene in isotactic polypropylene/natural rubber based thermoplastic elastomers

✍ Aju Joseph; T. Koch; S. Seidler; S. Thomas; K. Joseph 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 378 KB 👁 2 views

## Abstract The melting and crystallization behavior of isotactic polypropylene/natural rubber (PP/NR) based thermoplastic elastomers (TPEs) were investigated using differential scanning calorimetry. The samples were scanned at a heating rate of 10°C/min under nitrogen atmosphere. The effects of bl

Spherulite nucleation in blends of isota

Spherulite nucleation in blends of isotactic polypropylene with high-density polyethylene

✍ Z. Bartczak; A. Galeski; M. Pracella 📂 Article 📅 1986 🏛 Elsevier Science 🌐 English ⚖ 734 KB

Spherulite Growth Rate in Polypropylene/

Spherulite Growth Rate in Polypropylene/Silica Nanoparticle Composites: Effect of Particle Morphology and Compatibilizer

✍ H. Palza; J. Vera; M. Wilhelm; P. Zapata 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 680 KB

## Abstract Spherical and tube‐like (TL) silica nanoparticles were melt blended with an isotactic polypropylene (PP) matrix and its effect on the isothermal spherulite growth rate was analyzed by polarized optical microscope. The addition of low amount (≈1 wt.‐%) of either 15 nm spherical or TL par

Crystallization of isotactic (D,L) poly(

Crystallization of isotactic (D,L) poly(propylene oxide) in the presence of fine-particle silica. I: Radial growth rates of spherulites

✍ M. A. Kennedy; G. R. Brown; L. E. St-pierre 📂 Article 📅 1990 🏛 Society for Plastic Engineers 🌐 English ⚖ 784 KB

## Abstract The effect of added silica on the spherulite radial growth rates of isotactic poly(propylene oxide) (i‐PPrO) has been investigated by optical photomicroscopy. Two different i‐PPrO samples were used of different molecular weights and isotacticity, 87 and 100% as determined by ^13^C NMR.